US Bridges

Ia 23 over Stream

Fair

Mahaska County, Iowa · 1.2 Miles South of SR V13 · Structure no. 000000000601460

Built
1928
97 years old, rebuilt 1993
Condition
Fair
inspected February 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
2,170
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 23 over Stream is a concrete continuous culvert carrying Ia 23 over Stream in Mahaska County, Iowa. It was built in 1928 and reconstructed in 1993, so it is 97 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,170 vehicles a day, roughly 12% of them trucks, projected to reach 2,170 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesIa 23
CrossesStream
Location1.2 Miles South of SR V13
RouteState Highway 23
CountyMahaska County
StateIowa
Coordinates41.21246, -92.45916
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating18.7 US tons
Inventory rating6.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,170 (2023)
Projected traffic2,170 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ia 23 over Stream built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1993.

What condition is Ia 23 over Stream in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2024.

How much traffic does Ia 23 over Stream carry?

About 2,170 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Ia 23 over Stream?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns Ia 23 over Stream?

It is owned by the State Highway Agency.